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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '935f58eb95b9f134a9197c4ed1c8260fa0b6c1e0f5485bb0fea1840ef89256fe' 
  AND token = 'lXuowZ9MjVQeO54O92mZzMXD8b6jpezFnOmA7i+VACY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}